How do you keep water from freezing in winter?

[cassie]

There are heated waterers available. I have one but I don't remember where I got it. I did use google to do a search though.

 

[RonP]

After 4 years of successfully using a popcorn tin heater, it rusted...

I designed, sourced, and built this heater base to replace the tin.

Forever Water Heater one that lasts.